Wednesday

August 27, 2014

August 27, 2014

Number of results: 12,604

**PLZ HELP....STATS**

You are given the following data. # of Absences Final Grade 0 96 1 92 2 71 3 66 4 60 5 51 A. Find the correlation coefficient for the data. B. Find the equation for the regression line for the data, and predict the final grade of a student who misses 3.5 days.
*October 23, 2011 by Jennifer*

**Statistics**

The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
*March 15, 2013 by Kimberly *

**Statistics**

Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?
*December 2, 2012 by Julia*

**Statistics **

For the following set of scores: X Y 6 4 3 1 5 0 6 7 4 2 6 4 a) Compute the Pearson correlation. b) Add 2 points to each X value and compute the correlation for the modified scores. How does adding a constant to every score affect the value of the correlation? c)Multiply each ...
*April 24, 2014 by Mary*

**STATS**

X 3, 5, 6, 8, 9, 10, 12, 14, 15 Y 30,33,34,36,37,40, 50, 60, 70 Calculate Linear Correlation Coefficient r Use significance level 0.05 and Appendix Table A-6 to make decision about linear correlation between x and y.
*March 30, 2010 by Mary*

**STATISTICS**

True or False? A researcher is interested in studying whether there is a correlation of IQ with health. For this purpose he selected a sample of 261 people and asked them to complete two questionnaires: one for IQ and one for health. After evaluating the questionnaires each ...
*September 6, 2013 by Marian*

**statistics**

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. (a)One of the petals is 0.2 cm wider ...
*March 28, 2013 by pat*

**Business Statistics**

If the total variation in y values is 200, and the variation explained by regression line is 180, then the coefficient of determination is equal to __________. A) 1.11 B) 0.90 C) 0.81 D) 1.21 I picked D 1.21
*March 15, 2009 by Stuart*

**Math**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37 minutes; and 24.9º C ...
*May 1, 2013 by Brittany*

**algebra 1**

Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 minutes, 84.8 C after 9 minutes; 70.2º C after 18 minute; 54.4º C after 30 minutes; 42.5ºC after 37 minutes; and 24.9º C ...
*May 1, 2013 by Brittany*

**Stats**

Construct a scatterplot for the (x, y) values below, and answer the following questions. You do NOT need to submit your scatterplot with your answer; however, show all other work. x y 1 2.5 2 5.0 3 7.5 4 10.0 5 12.5 - What would be the slope of this regression line? - Would ...
*October 7, 2012 by Anonymous*

**statistics**

a training manager wants to know if there is a link between the hours spent by particular category of employeee in training and their productivity on the job. a ssmple of 10 employee files was randomly selected and the following data extracted: employee productivity hrs in ...
*April 27, 2007 by mary*

**Statistics**

How would you interpret the findings of a correlation study that reported a linear correlation of +0.3? I believe they have nothing in common because they are close to one. Please advise
*June 10, 2014 by Chevelle DuBois*

**Econ/stats**

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...
*April 29, 2012 by Ruth*

**Econ/stats**

The following data represent the number of flash drives sold per day at a local computer shop and their prices. Price (x) Units Sold (y) $34 3 36 4 32 6 35 5 30 9 38 2 40 1 a. Develop a least-squares regression line and explain what the slope of the line indicates. b. Compute ...
*April 29, 2012 by Ruth*

**Math**

is coefficient of correlation and coefficient of determination the same thing? or different?
*June 12, 2011 by Thara*

**Math**

is coefficient of correlation and coefficient of determination the same thing? or different?
*June 12, 2011 by Thara*

**math/stats**

If you square a correlation coefficient and subtract this number from 1.00, what is the result? Is it the coefficient of determination?
*February 6, 2010 by Patty*

**statistics**

These data were generated using the equation y = 2x + 1. A scatter diagram of the data results in five points that fall perfectly on a straight line. x 0 1 2 3 4 y 1 3 5 7 9 (a) Find the correlation coefficient.
*May 26, 2013 by DeeDee*

**stats**

Can someone please help me, I have been working on this for 2 hours now and I keep getting a negative answer. You are given the following data. Number of Absences Final Grade 0 99 1 94 2 79 3 73 4 68 5 53 - Find the correlation coefficient for the data. - Find the equation for...
*July 14, 2011 by Celest*

**social psy**

) Researcher wants to look at the correlation between class attendance and grade in class (higher numbers indicating a higher grade). The researcher found the following result r = .82. The correlation coefficient tells researchers two pieces of information, the strength of the...
*October 3, 2011 by deb*

**Stats**

Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars), X1 = display floor space (square meters), X2 = competitors’ advertising expenditures (thousands of dollars), X3 = advertised...
*September 30, 2010 by Mat*

**statistics**

Automobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in popularity. All these activities require the participant to wear a helmet that is certified by the Snell Memorial Foundation, a not-for-profit ...
*August 8, 2012 by Anonymous*

**Algebra**

2. Find the value of x^3 +2x^2 -3 when x =3 Answer-42 12. What type of correlation would you expect between the number of minutes a candle burns and the height of the candle? a. no correlation b. positive correlation c. negative correlation d. equal correlation Answer-c 13. ...
*August 7, 2011 by lizzie*

**statistics**

Please Help! My book and instructor are no help. Please help me understand why I need to make a scatter diagram, when dealing with bivariate data, and how to find SS(x), SS(y), SS(xy), and r. I have all the formulas, but don't understand. Thanks! I dont know that the diagram ...
*August 30, 2005 by Rebecca*

**Statistic**

Number of Absences Final Grade 0 93 1 93 2 77 3 68 4 65 5 54 - Find the correlation coefficient for the data. I got this part of my answer. I believe the answer to be -0.9767 I am just going crazy with the second part. - Find the equation for the regression line for the data, ...
*October 18, 2012 by Ashley S*

**Correlations**

Which type of correlation would you expect to see between the distance traveled and the time it takes to travel that distance? A. positive correlation B. negative correlation C. no correlation idk why this question is confusing me, but it is
*November 11, 2013 by hermes*

**algebra**

Which type of correlation would you expect to see between the distance traveled and the time it takes to travel that distance? A. positive correlation B. negative correlation C. no correlation idk why this question is confusing me, but it is
*November 12, 2013 by hermes*

**Statistics**

Hi Can anyone tell me in a regression model are the values of 0.13 0.10 A good indication of of the total y explained in a regression model ?? Thanks.
*June 4, 2009 by Gary*

**algebra 1**

*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3 minutes; 90º C after 5 ...
*May 2, 2013 by Brittany*

**statistics for health research**

1.A study is conducted to determine the factors that affect the increased maternal mortality rates in Kenya. Establish the variables (at least 5 variables) that you would use to conduct the study. State your expected results and explain how you will apply Correlation and ...
*June 16, 2014 by maureen*

**statistics**

what is the most likely answer for the confidence coefficient of linear correlation if x = the number of hours spent studying for a test, and y = the number of points earned on the test?
*August 20, 2010 by marie*

**Business Statistics**

Instructions: Prepare your answers using Excel and show your work to get full or partial credit. Question 1: Using the file Wages.xlsx which contains information of working individuals, for a nationwide firm (Value 7 points). a) Run Descriptive Statistics for the variables ...
*December 14, 2011 by Katie*

**Statistics**

Which, if any, of the values listed below for a correlation coefficient indicate a situation where more than half of the variation in one variable is associated with variation in the other variable? -.7 1 .3 .6 .9 I was thinking B
*November 12, 2012 by Mike*

**Economics**

Please correct if I have stated the right correlation to the following relationships: a) volume of auto traffic and auto accident rate -> 0 correlation b) pesticide and crop yield -> negative correlation c) consumption and GDP -> positive correlation
*January 25, 2011 by Anonymous*

**Psychology Statistics**

2 For a sample of n = 20 individuals, how large a Pearson correlation is necessary to be statistically significant for a two-tailed test with = .05? 3 The Pearson correlation is calculated for a sample of n = 25 individuals. What value of df should be used to ...
*April 26, 2013 by Chioma*

**statistics**

A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class. Test 1 Test 2 92 86 90 87 89 85 82 90 88 79 92 90 100 92 91 84 Is there a significant correlation? Explain its statistical significance, if any.
*February 12, 2012 by John*

**statistics**

8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...
*May 8, 2014 by Mary*

**statistics**

8.Jean Siskel is an entertainment analyst for West Coast Securities. He is trying to develop a model to estimate gross earning generated by a new movie release. He has collected the following data on 20 movies: Gross Earnings, Production Costs, Promotion Costs, and if the ...
*May 8, 2014 by Russel*

**math**

I need a definition for this constant rate of change when graphing in mathematics and for Positive and Negative correlation and also what the pattern is in this a) 1000, 100, 10, 1 I'll give you a definition for positive and negative correlation. Correlation is a linear ...
*January 10, 2007 by austin*

**statistics**

The data below are the average one-way commute times (in minutes) of selected students during a summer literature class and the number of absences for those students for the term. Calculate the linear correlation coefficient.
*April 6, 2013 by Anonymous*

**statistics**

True or False: A zero population correlation coefficient between a pair of random variable means that there is no linear relationship between the random variable.
*February 8, 2010 by iyra*

**Statistics**

Test the significance of the correlation coefficient r at a=0.05 for the data below. X values 59, 65, 73, 80, 89 Y values 97, 102, 110, 117, 125 A) Accept p=0 because 60.81<3.18 B) Reject p=0 because 61.13>3.18 C) Accept p=0 because 61.13<2.78 D) Reject p=0 because 60...
*May 7, 2012 by Lea*

**statistics**

1. In an ANOVA, one group has a much larger sample mean than the other. The analyst decides to remove this group and to conduct the analysis on the remaining groups only. Which of the following statements is correct? Select one: a. This analysis is not correct, as now the ...
*October 14, 2013 by Jumbo*

**math**

Bill is doing a project for you in the marketing department. Ln conducting his analysis regarding consumer behavior and a new product that has come out, he tells you the correlation between these two variables is 1.09. What is your response to this analysis. Judy conducted an ...
*June 5, 2014 by Erma*

**Statistics**

1.What is the p value (“significance level”)? What does this p value mean? 2.How does the n (sample size) of this sample affect the r and p values? 3.Is there a relationship between assertiveness and whether one holds anger “in”? Descriptive Statistics Mean Std. Deviation N ...
*June 16, 2010 by Donald*

**Statistics**

12.22 A regression was performed using data on 16 randomly selected charities in 2003. The variables were Y = expenses (millions of dollars) and X = revenue (millions of dollars). (a)Write the fitted regression equation. (b)Construct a 95 percent confidence interval for the ...
*September 26, 2010 by Kim*

**Finance**

Security A has an expected return of 7%, a standard deviation of returns of 35%, a correlation coefficient with the market of -0.3, and a beta coefficient of -1.5. Security B has and expected return of 12%, a standard deviation of returns of 10%, a correlation with the market ...
*July 4, 2011 by Jamal*

**Mth plz...help**

A linear regression equation of best fit between a student's attendence and the degree of sucess in school is h = 0.5x + 68.5. the correlation coefficent, r, for these data would be (1) 0 < r < 1 (2) -1< r < 0 (3) r = 0 (4) r = -1
*September 21, 2008 by Ashlee*

**Statistics**

Using the following information find a 95% confidence interval for the intercept in the regression of measured distance on recession velocity. VARIABLE COEFFICIENT STANDARD ERROR Constant 0.3391 0.1185 Velocity 0.001373 0.000227 T-STAT P-VALUE 3.369 0.0028 6.036 0.0000045 Est...
*March 14, 2007 by MMK*

**Stats **

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...
*March 28, 2013 by Judy*

**Stats **

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the petals is 0.2 cm wider ...
*March 28, 2013 by Judy*

**Statistics**

The eggs of a species of bird have an average diameter of 23 mm and an SD of 0.45 mm. The weights of the chicks that hatch from these eggs have an average of 6 grams and an SD of 0.5 grams. The correlation between the two variables is 0.75 and the scatter diagram is roughly ...
*March 15, 2013 by Emily*

**statistics**

What would you guess the value of the correlation coefficient to be for the pair of variables: "number of man-hours worked" and "number of units of work completed"? a) approximately 0.9 b) approximately 0.4 c) approximately 0.0 d) approximately -0.4 e) approximately -0.9
*August 2, 2011 by Anonymous*

**Statistics!!!**

b. The correlation between the number correct on a math test and the time it takes to complete the test is -.45. Test whether this correlation is significant for 80 children at the .05 level of significance. Choose either a one-or two-tailed test and justify your choice.
*July 8, 2013 by Ethel*

**statistics**

Consider the following table and use the formulas that are given for computing the correlation coefficient. (Give your answer correct to two decimal places.) x 1 1 0 0 0 y 7 3 5 6 6 r = n xy − x y n x2 − x 2 n y2 − y 2 (1) r = SS(xy) SS(x) · SS(y) (2) r = 1....
*June 23, 2013 by tracy*

**Psychology**

Four research participants take a test of manual dexterity (high scores mean better dexterity) and an anxiety test (high scores mean more anxiety). The scores are as follows. Person Dexterity Anxiety 1 1 10 2 1 8 3 2 4 4 4 -2 (c) figure the correlation coefficient; (d) figure ...
*September 19, 2011 by summer*

**math**

interpret an r value of -0.82. a)strong negative correlation B)weak negative correlation C)strong positive correlation D)no correlation
*November 13, 2009 by princess*

**statistics**

Suppose that in the aerobic exercise group we also measured the number of hours of aerobic exercise per week and the mean is 5.2 hours with a standard deviation of 2.1 hours. The sample correlation is -0.42. a)Is there evidence of a significant correlation between number of ...
*November 26, 2011 by natasha*

**Statistics**

foofy computes the correlation between an individual's physical strength and his or her college grade poing average. Using a computer, the correlation for a sample of 2000 people is r(1998)=+.08, p=<.0001. she claims this is a useful tool for predicting which college ...
*July 10, 2011 by K*

**Statistics**

Simple Linear Regression Analysis 2. Weight of Car: Miles gallon – Do heavier cars really use more gasoline? The following data were obtained from Consumer Reports (Vol 62 no. 4). Weight of car is in hundreds of pounds. Car Weight 27 44 32 47 23 40 34 52 MPG 30 19 24 13 29 17 ...
*December 7, 2011 by Kris*

**STATISTICS**

The following data represents the monthly natural gas consumption (in hundreds of cubic feet) for a family for a random sample of nine months selected from five years of data. The other variable is Degree-days which is a measure of temperature. Degree-days are the number of ...
*April 16, 2013 by Bettie*

**multiple regression**

5. HR Assistant Survey A sample of HR assistants in Plano Texas was created. It was suggested that the data should be analyzed with a regression model to determine if salary was related to years of experience, aptitude test scores, EI (emotional intelligence)scores, number of ...
*September 14, 2011 by Nina*

**Statistics**

Why do we need to distinguish between strong and weak correlation of data sets using best-fit lines? When a correlation has been established between the two data sets, how is it linked to causality? Please provide examples to support your answer.
*June 1, 2010 by immanuel*

**Math**

Find the value for the correlation coefficient r. x - 21 30 25 24 29 y - 49 41 31 36 39
*July 12, 2014 by Shelagh*

**Statistics**

In Professor White’s statistics course the correlation between the students’ total scores before the final examination and their final examination scores is r = 0.9. The pre-exam totals for all students in the course have mean 275 and standard deviation 50. The final exam ...
*October 21, 2012 by Kevin*

**Discrete Mathematics**

A tutor website wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the final scores out of 60 points. It came up with the ...
*July 30, 2013 by Joy*

**Discrete Mathematics**

3. A tutoring site wants to see how time spent studying for its content exams affects the ultimate scores. It asked its finite math test takers how much time they spent studying for the exam and compared that data against the final scores out of 60 points. It came up with the ...
*July 30, 2013 by Joy*

**statistics**

. For the table that follows, answer the following questions: x y 1 -1 2 -5 3 -9 4 - Would the correlation between x and y in the table above be positive or negative? - Find the missing value of y in the table. The missing value of y = How would the values of this table be ...
*October 4, 2012 by mom*

**MATH**

Prove that the correlation coefficient r lies between -1 and +1.
*February 18, 2011 by Sujit*

**statistics**

3. You obtain the following regression statistics for the relationship between defect rate and volume at one of your plants. You have a random sample of results from 160 shifts at the plant.
*January 1, 2011 by john*

**Org. Chem.**

Is there a correlation between the values of the distribution coefficients and the polarities of the three compounds? Explain. Place 0.050 g of one of the solids (benzoic acid, succinic acid, or sodium benzoate) in a vial and add 2 mL of methylene chloride and 2 mL of water. ...
*September 22, 2009 by CM*

**Math- Graphing Calculator Use**

I'm trying to figure out how to find the Q1, Q3, mean, standard deviation, median, and correlation coefficient. My manual is not clear. It says go to VARS and Statistics and then I can choose from there but I don't know how to get the answers it keeps saying error. I typed my ...
*October 16, 2009 by CM*

**statistics**

There is a table of AVERAGE monthly temperatures of two different areas of the same city. A scatterplot of the data is made to show that the relationship is linear between the two. If raw data was used instead of the averages to make the scatterplot, the correlation ...
*July 3, 2013 by Jon*

**math**

Construct a scatter plot for the given data. Determine whether there is a positive linear correlation, negative linear correlation, or no linear correlation.
*December 6, 2009 by jen*

**Statistics**

I neep help on two questions! A condition that occurs in multiple regression analysis if the independent variables are themselves correlated is known as: 1. autocorrelation 2. stepwise regression 3. multicorrelation 4. multicollinearity (I think this is the answer) Multiple ...
*September 14, 2008 by Debra*

**Statistics in Psychology**

A researcher finds that the correlation between variable A and variable B is r= 5 1.20. She also finds that the correlation between variable C and variable B is r= 5 2.40. Which relationship is scientifically more useful and by how much?
*February 10, 2014 by Annie*

**Statistics**

The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression ...
*April 4, 2012 by Amanda*

**Math**

Jade counted the number of the students on each sports time at her school and the number of wins the team had last season. If she displays her data on a scatter plot, what type of relationship will she most likely see between the number of students on a team and the number of ...
*October 18, 2011 by Please help*

**Statistics**

Critical Values for the Correlation Coefficient n alpha = .05 alpha = .01 4 0.95 0.99 5 0.878 0.959 6 0.811 0.917 7 0.754 0.875 8 0.707 0.834 9 0.666 0.798 10 0.632 0.765 11 0.602 0.735 12 0.576 0.708 13 0.553 0.684 14 0.532 0.661 15 0.514 0.641 16 0.497 0.623 17 0.482 0.606 ...
*February 12, 2014 by Stephanie*

**statistics**

In the following regression, X = total assets ($ billions), Y = total revenue ($ billions), and n = 64 large banks. (a) Write the fitted regression equation. (b) State the degrees of freedom for a twotailed test for zero slope, and use Appendix D to find the critical value at...
*March 15, 2012 by ronald*

**Statistics**

A regression equation was calculated and is given below. The values for Miss America are values such as 0, 1, 2, 3, 4, etc. Regression Analysis: GPA versus Miss America The regression equation is GPA = 3.32 - 0.0890 Miss America b. What is the response variable? The values of ...
*July 26, 2012 by Sheri*

**statistics**

A researcher finds that the correlation between variable A and variable B is r = +.20. She also finds that the correlation between variable C and variable B is r = -.40. Which relationship is scientifically more useful and by how much?
*May 29, 2014 by tiph*

**psychology**

correlation coefficient indicates a _______________ between two variables.
*January 28, 2012 by Anonymous*

**statistics**

We are studying mutual bond funds for the purpose of investing in several funds. For this particular study, we want to focus on the assets of a fund and its five-year performance. The question is: Can the five-year rate of return be estimated based on the assets of the fund? ...
*November 19, 2010 by Anonymous*

**algebra**

Which of the following is the best estimate of the correlation coefficient for the data shown below? (1, 18), (2, 12), (3, 20), (4, 16), (5, 22), (6, 30), (7, 28), (8, 40), (9, 34), (10, 29), (11, 33), (12, 39), (13, 44), (14, 39), (15, 28)
*June 8, 2014 by Amani*

**statistics**

Do you think there is a correlation between CEO salaries and the degree of success of a company? If you were to take a sample of companies with comparable size, market capitalization, and product category, and plot CEO salaries against the net profit of their respective ...
*December 17, 2011 by Mark*

**statistics**

The ages (in years) of 10 infants and the number of hours each slept in a day Age, x: 0.1, 0.2, 0.4, 0.7, 0.6, 0.9, 0.1, 0.2, 0.4, 0.9 Hours slept, y: 14.9, 14.5, 13.9, 14.1, 13.9, 13.7, 14.3, 13.9, 14.0, 14.1 Find the equation of the regression line. Then use the regression ...
*April 18, 2012 by Amanda*

**STATS**

A researcher conducted a survey on a sample of 2000 college-students in order to examine the relationship between academic achievement and procrastination of studying. Using several indicators and plots of the descriptive statistics, found that in the data were many outlier ...
*August 30, 2013 by Susie*

**Research and Statistics**

5. The table below shows Psychology exam scores, Statistics Exam scores, and IQ scores for a random sample of students. What can you observe in the relationship between IQ and psychology, psychology and statistics, and IQ and statistics? Using a web-calculator, obtain the ...
*September 11, 2010 by Moreen*

**Math**

Could someone answer this question so I understand it. The answer is 28.0, but i'd like to know how to do it. Thanks Randomly selected cars were weighed, and the highway fuel consumption amounts (in miles/gal) were determined. For 20 cars, the linear correlation coefficient is...
*November 30, 2011 by JAY*

**Math 120**

Which of the followinf could not be the value of a correlation coefficient? A) -0.683 B) 0.197 C) 1.000 D) -1.369
*May 3, 2011 by will*

**Math**

18. Find the value for the correlation coefficient r. (Points : 1) –0.073 –0.094 –0.203 –0.149
*June 7, 2011 by CC*

**Math**

Determine whether a correlation coefficient of r = –0.405 is significant at the 5% level for a sample size of 22
*January 27, 2012 by Constance*

**Math**

Determine whether a correlation coefficient of r = 0.471 is significant at the 5% level for a sample size of 20.
*July 12, 2014 by Shelagh*

**Statistics**

In a study on caffeine and stress, college students indicated how many cups of coffee they drink per day and their current stress level on a scale of 1 to 10. The table shows the survey results. Using a web-calculator, obtain the appropriate correlation coefficients. Number of...
*February 5, 2011 by SHelia*

**statistics**

In a large class, there were 220 students who wrote both the midterm and the final exam. The standard deviation of the midterm grades was 14, and that of the final exam was 20. The correlation between the grades on the midterm and the final was 0.60. Based on the least squares...
*September 22, 2012 by ashik*

**statistics**

Research reports a correlation of +0.8 between math achievement and math aptitude it also reports a correlation of -0.8 between math achievement and a math anxiety. Which interpretations is most c?orrect
*September 5, 2012 by Gee*

**Statistics**

Which of the following statements about the correlation coefficient r are true? I. It is not affected by changes in the measurement units of the variables. II. It is not affected by which variable is called x and which is called y. III. It is not affected by extreme values. I ...
*November 12, 2012 by John*

**Statistics **

Using advertised prices for used Ford Escorts a linear model for the relationship between a car's age and its price is found. The correlation coefficient is - 0.933 Determine R2 and interpret this statistic. A) R2 = 93.3% which means that 93.3% of the variation in car price is...
*May 26, 2013 by Katie*

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